Fig. 1.

Overview of the topical detector system used for classifying extravasation severity. A Single detector electronics that include a BGO scintillator coupled to a silicon photomultiplier and (B) placement of the two system detectors on the subject’s injection and contralateral arms; injection and reference detectors, respectively. C, D Representative TACs demonstrating signals from the injection and reference detectors, and their difference for subjects (C) with negligible and (D) moderate extravasation